Ezekiel 2:5

And thou shalt speak my words unto them, whether they will hear, or whether they will forbear: for they are most rebellious.

Moreover he said unto me, Son of man, all my words that I shall speak unto thee receive in thine heart, and hear with thine ears.

And when ye come into an house, salute it. And if the house be worthy, let your peace come upon it: but if it be not worthy, let your peace return to you. And whosoever shall not receive you, nor hear your words, when ye depart out of that house or city, shake off the dust of your feet. Verily I say unto you, It shall be more tolerable for the land of Sodom and Gomorrha in the day of judgment, than for that city.

Then Paul and Barnabas waxed bold, and said, It was necessary that the word of God should first have been spoken to you: but seeing ye put it from you, and judge yourselves unworthy of everlasting life, lo, we turn to the Gentiles.

For what if some did not believe? shall their unbelief make the faith of God without effect?

For we are unto God a sweet savour of Christ, in them that are saved, and in them that perish: To the one we are the savour of death unto death; and to the other the savour of life unto life. And who is sufficient for these things? For we are not as many, which corrupt the word of God: but as of sincerity, but as of God, in the sight of God speak we in Christ.